High gear = lower # as in 2.73
Low gear = high # as in 4.11
For a 1/4 mile race you want the rpm to be at red line( or ware ever rpm you start to lose power)in top gear- not overdrive-
Lets say 6000 is your shift point and you need to go through the traps at that rpm. You need a gear that puts you at that RPM @ 1320'
If 4.11 put you there, rpm's@1320, thats what you need. If you get to that point at 1000' you need a lower # gear
If you have 3.55 and your at 5000rpm @1320 you will be .3 slower than with 4.11